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. PRINTING TELEGRAPH. No. 436,740. Patented Sept. 16, 1890.

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' UNITED STATES PATENT OFFICE.

JOHN B. ODELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE PRINTING TELE- GRAPH COMPANY OF ILLINOIS, OF SAME PLACE.

PRINTING- TELEGRAPH.

SPECIFICATION forming part of Letters Patent No. 436,740, dated September 16,1890.

Application filed May 10,1886.

To all whom it may concern.-

Be it known that I, JOHN B. ODELL, a citizen of the United States, residing at Chicago, in the county of Cook, State of Illinois, have invented a new and useful Improvement in Printing-Telegraphs, which I desire to protect by Letters Patent of the United States, and of which the following is a specification.

The object of my present invention is to to obtain an increase of speed and certainty in the operation of printing-telegraphs by causing the rotation of the several type-wheels to depend as far as possible p nrely upon changes of electrical and magnetic conditions, and to I 5 this end I propose to provide for each instrument a prime motor, all the prime motors of the same line being made to move as nearly as possible at the same rate, and to connect and disconnect the several type-wheelsto and from their prime motors by purely electro-magnetic means. I am able in this Way to bring the several type-wheels to their position by merely changing the electrical condition of the mainline circuit for a proper length of time.

My invention consists, further, in certain arrangements and combinations of circuits and features of construction, hereinafter fully described, and pointed out in the claims.

In the drawings accompanying this specification and forming a part thereof, Figure 1 is a side perspective view of my apparatus, the two principal main-line magnets being, however, omitted therefrom. Fig. 2 is a view of my apparatus as it appears when looked at a from the under side of the table to which itis attached-i. a, from the direction of the arrow 2 in Fig. 1. Fig. 3 is a perspective view of a part of the key-board. Fig. 4 is a sectional View of the same. Figs. 5 and 6 are views on an enlarged scale of the principal main-line magnets. Fig. 7 is an end view of the paper-carriage and the magnet for rotatin g the paperroll. Fig. 8 is a side view of the paper-carriage, showing the magnets which affeet and control its to-and-fro movement. Fig. 9 is a side View of the type-wheel, and Fig. 10 a sectional View of the same. Fig. 11 is a sectional View ofinsulated rings attached to the rotating shaft of the prime motor, through which an electrical current is carried to a magnet mounted on said shaft. Fig. 12

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shows the rest or stop for the armature-lever of the printing-magnet. Fig. 13 shows a front view of the armature and armature-lever of the printing-magnet and its attachmentto the frame-work. Fig. 14 is a diagrammatic view of some of the principal circuit-connections. Fig. 15 is also adiagrammatic View of the prin cipal circuit-connections, showing the connection between the transmitting and receiving instruments. Fig. 16 is a diagrammatic view showing the circuits for rotating the paperroller. Fig. 17 is a diagrammatic view showing the circuits for imparting step-by-step movement to the paper-roller and for retracting the same. Fig. 18 is a diagrammatic View of the circuits for operating the unison device. Figs. 19, 19, and 19" are detailed views illustrating the construction of the unison device.

Similar letters and figures denote like parts throughout the several views.

The key-board may be made in any approved form. That which I have devised consists of a series of metal key-levers 23, pivoted at one end to the under side of an insulating base-board 28, set into the table-top 24 and provided at their centers With pivoted plungers 25, passing up through the baseboard. These levers and plungers are equal 5 in number to the characters to be sent plus several required for various purposes in manipulating the instrument, as hereinafter described. Near the free end of each lever a contact-point 26 is fixed to the baseboard in a position to meet an arm 27, attached to the lever, when the latter is drawn up into its normal position by spring 150. A diagonal wire 26 connects each point 26 with the lever next to iton one side, as shown in Fig. 3. To the under side of each lever is attached a 0 spring 29, adapted to strike the periphery of one of a set of disks 30, fixed to a main shaft 31. The bodies of these disks are of metal and are in electrical connection with each About their 5 peripheries is a ring of insulating material 32, through which and somewhat beyond the contour thereof projects a tooth 33 from each disk. The play of each key is limited by a collar 34 on plunger 25, and each spring 29 is I00 so adjusted that it will clear the tooth 33 when its key is in its normal position, and will be touched by the tooth 33 as the shaft 31 revolves when its key is in its extreme depressed position. I prefer that these springs shall never touch the rubber bands 32, to avoid the accumulating of dirt upon their faces. The rubber band may, if desired, be wholly dispensed with, its only function being to prevent possible accidental contact between the spring and the metal of the disk.

The circuit-connections of the key-board are shown in Figs. 3 and 14. The main line is attached to one of the end keys of the board, and the circuit passes thence over contact-points 26 27, diagonal wires 26, and the other keys of the key -board successively, a connection being made from the last contact 26 by wire 141 to the main battery and ground. .The disks 30 are also connected with the main battery, so that the depression of any key at first breaks the main circuit and then closes it again as its spring 29 touches the metal:

tooth 33 of its disk. The shaft 31 also carries the type-wheel (Shown in detail in Figs. 9 and 10.) This wheel consists of a full metal disk 36, fixed to the shaft and carrying on one face a ring-plate 37, the two plates being connected by two rows of-pillars 38, so placed as to leave between them rectangular openings, in which ordinary printers type may be placed. Each type is provided with a spring 39, by which it is held in place, but which yields to permit the type,

to be driven out by a blow from the end of the armature-lever 19 of the printing-magnet and returns it to its normal position after the impression has been made. of ring 37 are formed teeth 40, between which are slots, one for each type. These teeth have pointed ends, the bevels serving to bring the type into alignment with the printing-lever whenever the type-wheel in its revolution has been stopped before or after reaching its alignment for the desired letter to be printed. The printing-lever, having more power than the brakemagnet that is holding the typewheel by its magnetism, slips the circular brake-armature fasten ed onto the type-wheel shaft until the printing-lever can enter the slot between the teeth, thus allowing a leeway for each type equal to the distance between said teeth for any inaccuracies that may occur in the transmission of the current over the main line.

A number of slots are left without types and correspond to the keys above referred to, used for other purposes than transmitting characters.

The armature-lever of the printing-magnet is pivoted to the frame-work, as shown in Figs. 1, 13, and 14, and when its magnet is deenergized is pushed by a spring 142, so as to rest upon a hanging arm 18, which is provided with an electrical contactpoint 143, upon which the armature-lever directly rests. The armature itself is recessed so as to straddle the shaft 31, which passes between the two limbs of the printing-magnet. (See Fig. 13.)

On theinner edge Nearthe outer end of shaft 31 is fixed to the frame-work a brake-magnet 13, the armature of which is a disk 42, fixed to the shaft and moving in close proximity to the polepieces of the magnet. Fixed to the extreme end of the shaft is a second armature-disk 43, one of its surfaces in close proximity to the poles of a magnet 44, mounted on a shaft 45, constantly revolving under the influence of a prime motor 46. The circuit of magnet 44 is made through two insulated rings 47 48, (see Fig. 11,) mounted on the shaft, on which rest, respectively, brushes 49 50. Energization of magnet 44 instantly unites shafts 45 and 31 and causes the latter to revolve. Magnet 13, energized at the moment 44 is de-energized, acts as an instantaneous brake, arresting the rotation of shaft 31.

At the other end of the shaft 31 is a unison mechanism,which consists of a spiral 51, fixed upon the shaft, and a magnet 3. whose armature 52 carries a pivoted lever 53, which has at its lower end a pin or rod 54, projecting backward toward the groove of the spiral, so as to enter the groove when the magnet is deenergized and its armature retracted by its spring 55. The lower end of lever 53 is drawn sidewise by spring 56, which causesthe upper end of the lever to bear against the pin 57 on the armature. When the rod 54 falls into the groove and remains there, the lower end of the lever is carried to the left by the revolution of the shaft to the left, causing its upper end to strike a spring 53 and force it against a contact-point 59, thus closing a circuit through wire 60, magnet 63, wire 61, battery and wire 16 and 62, which results in operating the circuits controlling the magnets 44 and 13 and arresting the rotation of the shaft, as will be hereinafter explained. The contactpoints are so adjusted that a predetermined number of revolutions will close the circuit, arresting the type-wheel in a predetermined position, this position corresponding to ablank in the type-wheel, all the instruments on the same line being adjusted to stop at the same position. It is plain that unison can be secured by allowing the main-line circuit to remain open for a period of time longer than it takes to revolve the shaft the predetermined number of times.

The paper is mounted on a carriage 64, rolling on ridges and carrying three rollers 66 67 68, (see Fig. 7,) the paper passing around the large roller between it and the smaller ones. The axes of the two smaller rollers 67 and 68 are mounted in yoke-pieces 69, which are adjustable in slots in the end pieces of the carriage to and from the large roller, so that the carriage may be set to carry any desired quantity of paper, according to the nu mber of impressions desired. The large roller has a central longitudinal opening through it, which is extended through the end pieces 70 of the carriage, and within this is hung a ratchet-cylinder 71, journaled at its ends in brackets 72 73, fixed to the table. Attached to the end of the cylinder 71, next to bracket 73, is a downwardly-projecting arm 7 4:, carrying the armature of magnet 76. On the end of the roller 67 is a spring-pressed pawl 77, engaging with the teeth of the ratchetcylinder and causing the roller to be rotated step by step as the circuit of magnet 76 is successively made and broken, feeding the paper forward. The end 70 of the carriage is countersunk to receive the pawl 77 and its spring.

Referring to Figs. 1 and 16, the circuit of magnet 76 lies through battery 5, wire 83, magnet 76, wire 78, spring-contact 81, collar 79, wire 80, arm 81, spring-contact 82, armature-lever 19, and wire 20.

position that the spring-contact 82 will strike the end of arm 81, when the printing-magnet is energized, and this position of the shaft corresponds to one of the blanks of the typewheel and one of the keys of the key-board set apart for operating this magnet.

The longitudinal motion of the paper-can riage is effected step by step toward the left against a weight, which tends to draw it to the right (see Fig. 17) by means of magnets 8i and 85. The armature-lever 86 of magnet 84 is provided with a hook, which is normally pressed bya spring 87 upon a toothed bar 88, attached by hanger 89 to the carriage, said hanger 89 moving in a slot 90 (see Fig. 2) in the table. The armature-lever 91 of magnet carries at its lower end a pivoted pawl 92, pressed by a spring 93 against a stop 94. When the armature-lever is in its retracted position, the upper end'of pawl 92 is pressed downward by an adjustable stop 95, so that its point is raised above the teeth of the bar 88; but as the armature-lever starts forward under the influence of the magnet the point of the pawl is forced down by its spring, catches upon the teeth of the bar, and draws the carriage a step to theleft, where it is held by the hook of lever 86.

Referring now to Figs. 1 and 17, the circuit of magnet 84 is made through battery 5, wire 20, armature-lever 19, spring-contact 82, arm 99, wire 98, collar 97, arm wire 96, magnet 84, and wire 100, and can be closed only when the spring-contact 82 is opposite to the end of arm 99, a position corresponding, as in the case of magnet 7 6, to a blank on the type-wheel and a key on the key-board. The circuit of magnet 85 is made through battery 5, Wires 6 and 21, magnet 85, wire 22, hanging arm 18, armature-lever 19, and Wire 20, and the magnet will therefore be actuated after each impression from the type-wheel as the armature-lever drops upon its rest, moving the paper forward one step. Moreover, the pawl 92 is normally held in engagement with bar 88, and the paper-carriage is thus kept from accidental displacement when the apparatus is not in operation.

A pawl 101, also attached to armature-lever 91, operates on a toothed disk 102, on the shaft This circuit will be closed only when the shaft is in such a 103 of which is mounted a drum 104, carryin g one end of the ink-ribbon 105, which passes over rollers to a second drum 106.

It is plain that when the instrument is used as a transmitter it is a waste of force to move the heavy paper-rollers forward and back. A switch 107 is therefore provided (see Fig. 14) for cutting out the local magnet 134, (which controls the printing-magnet 7.) It also cuts out the three magnets 84, 85, and 76, which control the feed .of the paper, (not shown in Fig. 14, but in Figs. 16 and 17,) and cuts in in their stead two magnets 8 and 9, operating an indicator-finger 108, moving in a slot in the table 109 under the influence of a weight 110. The magnet 8'is' provided with a hooked armature-leverlll, similar to that of magnet 84, already described. The armature-lever 112 of magnet 9 has at its lower end a pivoted pawl, which normally rests in the teeth of the bar 113, and has a finger 114, which extends out over the end of lever 111. The length of stroke of this armature-lever is regulated by an adjustable stop 115. Upon shaft 31 is located collars with springs 119, 121, and 127 bearing thereon, and so constructed that in one position of the shaft only will both springs 119 and 121 rest upon metal for the purpose of electrically connecting said springs together, and springs 127 rest upon insulating material only at the time that springs 119 and 121 are resting upon metal, so that the circuit of magnet 9 will be open when circuit of magnet 8 is closed, and at all other points of the collar the springs 119 and 127 rest upon metal, so

that the circuit of magnet 9 is closed through d the springs 119 and 127 at all tin1es,with the exception of the one position above referred to, and spring 121 rests upon insulation during the time that springs 119 and 127 are on metal, so that the circuit of magnet 8 cannot be closed, and that this one position must correspond to a blank in the type-wheel and a key in the key-board for the purpose of returning the paper-roller to its stationary position. As the paper-roller at the distant end of the line moves one notch every time a letter is printed, so must the indicator move one notch, and said indicator must be returned to its starting-point at the same time that the receivers roller is returned.

The circuit of magnet 8 is through wires 116 and 117, switch 107, wire 12, brake-magnet 13, wire 14:, armature-lever 15, wire 16, battery 5, thence through wire 118, springs 119 and 121, (when connected by the metal tooth 124 on the collar,) and thence through wire 122. Spring 119 rests upon a metal ring 125, which is all metal, with the exception of one small insulated space 126. The metal ring 125 is electrically connected with the tooth 124.

The circuit of magnet 9 is seen in Fig. 14, and is made through battery 5, wire 118, springarm 119, insulated collar 125, spring-arm 127, wire 128, magnet 9, wire 117, and switch 107.

Spring 127 is so placed that it rests on insu-. lation 126 only when spring 121 rests on metal tooth 124. From this construction it is plain corresponds the key and the blank on they type-wheel provided for working magnet 84 of the receiver,) that the two magnets 8 and 9 can never be energized together, and that the magnet 9 will always receive an impulse Whenever the main line operates the armature 15 of relay 1, except when spring 127 is on insulation 126. When the magnet 8 is energized, the end of its armature-lever lifts the pawl 114 and permits the indicator-finger to be drawn to the right by the weight. This finger, it need hardly be stated, shows to the sender of a message the progress of the paper-carriage to and fro above the type-wheel at the receiving end.

When used as a receiver, my apparatus operates as follows: The switch 107 is then thrown, as shown in Fig. 14, so as to cut the indicator-magnets 8 9 out of the local circuit and cut in printing-magnet 7 and paper-carriage and magnets 85, 84, and 76. The mainline circuit (shown by heavy line in Fig. 14) is normally closed, energizing the main-linecircuit-controlling magnets 1 2 and unisonmagnet 3. The circuit of local battery 5 is therefore also normally closed through wires 6 and 129 spring 130, contact-point 131, wires 132 11 12, magnet 13, wire 14, armature 15, and wire 16, shunting and rendering inoperative the prin ting-magnet 7. All the other local circuits are normally open, except that of paper-feeding magnet 85, Fig. 1, which is closed through hanging arm 18, armature-lever 19 of printing-magnet 7, and wires 20, 21, and 22. The depression of a key by the trans= mitting-operatorbreaks the main-line circuit, as explained above, causes the armatnres of magnets 1, 2, and 3 in the receiving-instrument to drop back, and throws the current of local battery 5 through magnet 44, causing the main shaft 31 to revolve. The closing of the main circuit as the depressed key strikes the tooth of its revolving disk breaks the 10- cal circuit of magnet 44 through the movement of armature 15 and stops the main shaft and type-wheel in position for printing. The armature-lever 133 of magnet 2 does not respond,however, being held back by its spring and the attraction of magnet 134, the circuit of which is made through battery 5, wire 136, switch 107, wire 135, magnet 134, wire 140, armature 133, wire 139, contact-breaker 138, and wire 137. The shunt around magnet 7 is therefore broken, and this magnet is energized. Its armature-lever rises and strikes the positioned type against the paper. As the armature reaches the end of its stroke, however, it opens the circutit of magnet 134 by striking the spring of the circuit-breaker 138, hereinafter described. The armature-lever 133 is released, and, returning under the influence of magnet 2 to its front stop, closes the shunt around magnet 7. Armature-lever 19 now returns to its normal position, allowing the type to drop from the paper, andas it meets hanging arm 18 the circuit of magnet 85 is closed, whereby the paper is moved forward one space, and also the type-ribbon.

WVhen used as a transmitter, switch 107 is reversed from the position shown in Fig. 14. The circuit of battery 5 will thenbe normally closed through wire 16, armature-lever 15, wire 14, magnet 13, wire 12, switch 107, Wir'e 117, magnet 9, wire 128, spring 127, ring 125, spring 119, and wire 118,back to battery 5, the printing-magnet being permanently cut out. On breaking the circuit magnet 13 will, as before, he cut out and magnet 44 energized. WVhen the paper-carriage isto be moved longitudinally, the proper key will be struck to bring the shaft into such a position that the circuit of magnet 8 will be closed, as before described, this key also closing the circuit of magnet 84 in the receiving-instrument.

The follow-spring 144, attached to armature 15, is for the purpose of preventing the momentary breaks in the main-line circuit as the transmitting-keys rise from their depressed to their normal position from affecting the local circuits of the receiver.

I will now more fully explain the operation of printing. Both home and distant instruments are connected as shown in Fig. 15. For illustration, We will take the letter J. It will be noticed that it is located just onequarter of the circle of the type-wheel. The disk corresponding to the letter J is in the same relative position. Upon depressing the key-lever J the main line is broken at the points 26 27. This de-energizes the mainline magnets 1, 2, and 3, allowing their armature-levers to fall back. As armature-lever 15 of relay 1 falls back it opens the circuit of the brake-magnet 13 and printing-magnet 7. Upon de-energization of magnet 13 the tension on shaft 31 is released. As armaturelever 15 strikes its outward stop it closes the circuit of magnet 44, revolving on the primemotor shaft 45. Energization of magnet 44 locks the type-wheel shaft 31 and prime-motor shaft 45 through the medium of the circular armature 43,fastened on shaft 31, thereby revolving the type-wheel as long as locked. As the armature-lever 133 of relay 2 falls back, it opens the shunt-circuit around the printing-magnet 7 at the points 130 131, and at its outward limit closes the localcircuit of magnet 134 through the battery 5, wire 16, wire 135, magnet134,wire140,lever-133,wire139,springcontact 138, and wire 137, to battery. The local current through magnet 134 is stronger than the main-line current of magnet 2. To prevent armature-lever 133 being drawn forward by the main current and thus shunt out the printing-magnet 7 before it has operated, the points 130 and 131 remaining open allows the current to pass into magnet 7 when relay 1 closes the circuit of the brake-magnet, they both being in the same circuit. As the typewheel shaft 31 revolves around the metal tooth IIO 33,0n the disk 30 strikes the spring-catch 29 on the key J, depressed in its path, and closes the main-line circuit through the disk to the battery. As the main line closes unison-relay 3 draws its armature-lever from the spiral 51, (shaft 31 not revolving enough times to operate the unison device,) the pivoted end is returned by the force of spring 56 to its normal position, relayl draws its armaturedever 15 forward, breaking the circuit of magnet 44, thus releasing the prime-motor shaft 45 from shaft 31, and closing on its forward stop the circuit of the brake-magnet 13 and printingmagnet 7. Energization of magnet 13 arrests J the type-shaft 31 through the medium of the circular armature 42, fastened to the shaft 31. Upon energization of magnets 7 its upper end strikes the type, forcing it against the paper. As itreachesits outward limit of travel its lower end strikes the spring-contact point 138, opening the local circuit of magnet 134.

De-energization of this magnet allows the main-line current in magnet 2 to draw armature-lever 133 to its forward stop, forcing the spring-contact point 130 against adjustable point 131, closing the shunt-circuit around the printing-magnet 7 de-energizin g it, allowing its armature 19 to return to its normal position, the type to withdraw, and springcontact point 136 to close. The type-wheel remains locked in this position until the main line is again opened. It is plain if the shafts 31 of all the instruments are picked up at the same time and stopped at the same timethey must all operate the same, the letters and spaces being arranged alike in all instruments and all started at the same point. After printing a letter the paper-rolleris moved one space for the next letter, operation of which is shown in Fig. 17, the armature-lever of magnet having a pivoted pawl at one end engaging a rack-bar 88, fasten ed to the papercarriage. The armature-lever 19 of the printing-magnet 7 normally holds the circuit of magnet 85 closed at the point 18. Energization of magnet 85 holds the pawl in engage ment with the rack-bar 88. As the armature 19 is drawn forward to print this circuit is broken and the pawl drawn back by the spring on armature-lever 91 for a new stroke. As armature 19. returns to its normal position it again closes this circuit, the pawl engages the rack-bar and draws the carriage forward the desired distance, and is held by the hooked armature-lever 86 of magnet 84. As armature-lever 19 moves after the first break, it is plain that by having a key set apart for moving the paper-carriage and a blank space in the type-wheel, so lever 19 cannot print, we

can move the roller rapidly forward to any desired position by repeatedly opening and closing the main line by this key.

When the roller has reached a point we may desire to return it from, it is done in the following manner: Akey is shown in Fig. 17 especiallyfor this purpose. Its tooth 33 on disk .30 is located just half of the circle and a blank insulated arm 99 on shaft 31 will now be directly under an extension from the armature 19 of printing-magnet 7, and will be struck by said armature at the point 82, thus closing the circuit of magnet 84, heretofore referred to, and as this circuit is completed it withdraws the hooked armature 86, holding the toothed or ratchet bar 88, allowing the weight to draw the paper-roller back to its starting-point. As the armature 19 strikes the contact-point99, it cannot travel forward far enough to strike contact-point 138, and relay 1, having closed, holds the current in the printing-magnet 7. The only way we can release the armaturepf magnet 7 is by opening the main line again, and the same (or another) key may be used that feeds the roller forward step by step. It will be seen that we must give the roller time to return, and no key will be depressed until suflicient time has been allowed for its return. After another key is depressed, contact-point 99 will be moved from under armature 19, allowing the armature to open circuit of magnet 134 at spring-point 138, and all return to their normal positions.

The following operation rotates the roller. (See Fig.'16.)' (The end of the roller is shown here to better illustrate it.) The disk and blank for rotating theroller, as shownin Fig. 16, is located about three-eighths of the radius from the printing-line. As the key for rotating the paper-roller opens the main line the disk and type-wheel are carried forward and stopped, as explained in printing J. As the main line closes and the armature 19 of the magnet 7 is drawn downward itstrikes contact-point 81, located on shaft 31, (same as point 99, but in different position,)( closing the circuit of the rotating magnet 76 through the heavy lines shown in Fig. 16. As the armature lever 74 is drawn to the magnet 76, it rotates the roller one step. The main line must be opened again to release this armature by the key used to feed carriage forward, or some other key especially for this purpose,and this operation can be carried on at will.

The operation of the unison device is as follows: For illustration, we will say that the unison device on all the instruments in the line is adjusted to stop the type-wheel after revolving three times. A key, as shown in Fig. 18, is set apart to open and close the main line independent of the disks on shaft 31. To operate the unison device, the key opens the main line at the points 26 27, and is closed at the same points after sufficient time has been allowed all the shafts 31 to revolve three times or more. As the armaturelever 15 of relay 1 falls back upon de-energization it opens the local circuit of the brakemagnets 13 at the point 144. As armature 133 of relay 2 falls back it opens the shunt-circuit around magnet 7 at the points 130 and 131. De-energization of magnet 13 releases tension on shaft 31. As armature 15 reaches the limit of its back-stroke it closes the circuit of the magnet 44, revolving on the primemotor shaft 45. Energization of this magnet picks up shaft 31 through the medium of the circular armature 43, fastened to shaft 31. As the armature 133 of relay 2 reaches its outward limit it closes the local circuit of magnet 134 by way of wires 139, spring-contact point 138, wire 137, battery 5, wires 16 and 135,through magnet 134, wire 140, and contact-point and armature 133. The closing of this circuit prevents the mainline current from drawing armature 133 of relay 2 away from its back contact until it is opened at the spring-contact point 138 by the armature-lever of magnet 7 striking it, the local magnet point 58 against contact-point 59, closing the local circuit of magnet 63. (Shown in heavy lines in Fig. 18.) Energization of magnet 63 draws armature-lever 15 away from its backstop, opening the circuit of magnet 44, and

closing on its forward stop the circuit of brake-magnet 13 and printing-magnet 7. Energization of magnet 13 instantly arrests shaft 31 through the medium of circular armature 42. At this point a blank in the same relative position in all of the type-wheels is presented under the printing armature-lever 19. Energization of magnet 7 draws the printing-lever 19 forward until its lower end strikes the spring-contact-point 138, its upper end occupying the vacant space in the' type-wheel. When the armature 19 strikes the spring-contact point 138, it opens the local circuit of the magnet 134. There being no current in the main-line magnet 2, the armature 133 remains in its position ready to be drawn forward upon closing of the main line. All of the several armatures remain in this position until the main line is closed. After sufficient time has been allowed all the shafts 31 to revolve more than three times the key that effected-this operation is released, closing the main line at the points 26 27. As the main line energizes unison-magnet 3 its pivotedarmature-lever53 is drawn out of the groove 51, and the spring 56 draws it sidewise back to its normal position. This operation opens the local circuit of magnet 63 at the points 58 and 59; but as the main-line current has entered the'magnet 1 it holds armature-lever 15 in its present position, thus preventing the opening of the brake-magnet 13, which continues to hold shaft 31 until the main line is again opened. Energization' of main-line magnet 2 draws armature 133 forward, farther opening the circuit of local magnet 134' to prevent its being energized upon closing of spring contact-point 138 when magnet 7 is de-energized. Referring now to Fig. 18, the forward movement of armature 133 closes the shunt -circuit at the points 130 131, around magnet 7 by way of battery 5, wire 6, wire 129, spring-contact 130, contactpoint 131, wire 132, magnet 13, wire 14, contact-point 144, armature-lever 15, and wire 16, to battery, de-energizing magnet 7, allowing its armature-lever to withdraw from the blank in the type-wheel. It will now be seen that all the instruments in the line are standing at the same relative position ready to start from this point upon operating the printingkeys.

Itis plain that as it does not take more than one revolution to print any letter the pivoted lever 53 of the unison device dropping into the spiral 51 as the main line opens and closes to print has no effect unless the line is opened for a period longer than is needed for printing, and in case of the main line breaking or accidentally opening all instruments after revolving a predetermined number of times will come to the same stop and remain so until started again.

It will be seen that it is not necessary for the prime motors to run absolutely true. For

example, if one prime motor is revolving its shaft sixty times a minute and another fifty, and as it never takes more than one revolution to print a letter, the difference is so small in so short a space of time as to be readily corrected by the bevel-notches on the type-wheel, and it will not be necessary to work the unison device except after long periods of printing.

I claim- 1. In aprinting-telegraph, the combination of a prime motor, a type-wheel, an armature rigidly connected with said type-wheel, and

an electro-magnet carried by said prime motor and adapted when energized to attract said armature, thereby transmitting motion to said type-wheel.

2. In a printing-telegraph, the combination of a prime motor, a type-wheel, an armature rigidly connected with said type-wheel, an electro-magnet carried by said prime motor and adapted when energized to attract said armature, and means for stopping the movement of the type-wheel upon de-cnergization of said magnet.

3. In a printing-telegraph, the combination of a prime motor, a type-wheel, an armature rigidly connected with said type-wheel, an electro-magnet carried by said prime motor and adapted when energized to attract said armature, and a second electro magnet adapted when energized to arrest the movement of the type-wheel.

4. In a printing-telegraph, the combination of a prime motor, a type-wheel, an armature rigidly connected with said type-wheel, an

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electro-magnet carried by said prime motor and adapted when energized to attract said armature, a second armature, also rigidly connected with the type-wheel, and a second stationary electro-magnet adapted when energized to attract said second armature and .arrest the movement of the typcwvheel.

5. In a printing-telegraph, a prime motor, an electro-magnet carried thereby, a suitable shaft, a type-wheel on said shaft, an armature on said shaft in operative relation with said electro-magnet, a second armature on said shaft, and a stationary electro-magnet in operative relation to said second armature.

6. In a printing-telegraph, the combination of a main line, a main-line magnet, a typewheel, mechanism between the type-wheel and the main-line magnet, whereby the former is caused to be rotated by the latter, a printing-magnet in a local circuitcontrolled as to its electrical condition by the main-line magnet, paper-moving mechanism controlled by the printing-magnet, magnets in a local circuit controlling an indicator, and a switch and electrical connections whereby the local battery may be thrown either through the print ing-magnet or the indicator-magnet, substantially as described and shown.

7. In a printing-telegraph, the combination of a main-line circuit, a magnet in said circuit, a local circuit closed by the armature of said magnet when in one of its positions and operative when closed to effect amovement of the type-wheel, a second local circuitclosed by the said armature-lever when in its other position and operative when closed to bring the type-wheel to a stop and hold it securely when so arrested, a printing-magnet in said second local circuit, a second magnet in the said main-line circuit, a shunt for the printing-magnet closed by the armature of said second main-line magnet when in one of its positions, a magnet in a third localvcircuit placed so as to influence the armature of said second main-line magnet and effective when energized to keep the said shunt open, and a circuit-breaker in said third local circuit adapted to be operated by the armature-lever of the printing-magnet when said magnet has reached the end of its forward stroke, substantially as described, and for the purpose set forth.

8. In a printing-telegraph, the combination of a normally-closed main-line circuit, a mag net in said circuit, a local circuit closed by the armature of said magnet when in its forward position, said local circuit when closed being operative to cause the rotation of the type-wheel, a second local circuit closed by the armature of said main-line magnet when in its retracted position and operative when closed to arrestthe rotation of the type-wheel, a printing-magnet in said second local circuit, a second magnet in the main-line circuit, a shunt for the printin g-magnet closed by the armature of said magnet when in its forward position, a magnet and a third local circuit therefor placed to operate upon the armature of said second main-line magnet and of such strength as to hold said armature in its retracted position when energized in opposition to the pull of the main-line magnet, and a circuit-breaker in said third local circuit adapted to be opened by the armature-lever of the printing-magnet at the end of its for ward stroke, substantially as described and shown.

9. In a printlug-telegraph, the combination of a printing-magnet normally out of circuit, a paper-carriage, a magnet for giving step-bystep endwise motion to the same, a local circuit for energizing said magnet controlled by the armature-lever of the printing-magnet as it moves to and from its normal position, a magnet for causing the paper-carriage roll to rotate, and a local circuit for said magnet controlled by a circuit-closer, one element of which revolves with the typewheel, the 566- 0nd element being carried by the armaturelever of the printin g-magnet and brought into contact with the first element by the forward movement of said armature-lever, the position of the shaft which permits contact of the two elements of the circuit-closer on the energization of the printing-magnet eorrespond ing to a blank in the typeavheel, substantially as described, for the purpose set forth.

10. In a printing-telegraph, a magnet for controlling the feed of the paper and a circuit therefor, said circuit being provided with a circuitcloser, one element of which moves with the revolving shaft of the type-wheel,

the other element being carried by an armature-lever, and a magnet, controlled as to its electrical condition through the main-line circuit, for operating said armature-lever, the position at which the moving element of the circuit-closer will come in contact with the element attached to the armature-lever when the latter moves toward it under the influence of a change in the electrical condition of its magnet corresponding to a blank in the type-wheel, substantially as described, and for the purpose set forth.

11. In a printing-telegrapl1,tl1e combination of a printing-magnet, a type-wheel, an armature of the said magnet carrying one-element of a circuit-closer, the other element of which revolves with the type-wheel shaft and is brought'into position to come in contact with the element carried by said armature-lever on the energization of the printing-magnet at a point in the revolution of the shaft corresponding to a blank in the type-wheel, a paper-carriage adapted to move to and fro across the type-wheel, a magnet for controlling said to-and-fro movement, and a local circuit for said magnet controlled as to its electrical condition by said circuit-closer, substantially as described, and for the purpose set forth.

12. In a printing-telegraph,the combination of a printingmagnet, the armature lever therefor carrying a contact-point, a paperroller capable of to-and-fro and rotary motion, two magnets adapted to effect these two movements of the paper-roller, respectively, and electrical circuits for said magnets, in each of which the contact-point on said armaturelever is an element, a contact-point in each of said circuits being attached to the rotating shaft and corresponding in position to a blank in the type-wheel, whereby either of the contact-points may be brought opposite to the contactpoint attached to the armature-lever and its circuit closed by the energization of the printing-magnet, while it is impossible to energize both of said circuits at the same time, substantially as described.

13. In a printing-telegraph, a unison device consisting of a magnet in the main circuit, a

mechanism thrown into contact with the revolving shaft of the type-wheel by a change in the electrical condition of the magnet and continuously moved thereby as the type-wheel continues to revolve, a circuit-controller operated by said mechanism after a predetermined number of revolutions of the shaft, and a magnet in said circuit controlling the rotation of said shaft, substantially as described and shown.

14. In a printing-telegraph,as a unison device the combination of a magnet in the mainline circuit, a pivoted armature therefor, a lever pivoted to said armature, a pin on the end of said lever, a spiral attached to the shaftof the type-wheel and adapted to engage with the said pin when the magnet is de-energized and the armature falls back, a circuitcontroller adapted to be operated by said pivoted lever when it has been moved a certain distance by the engagement of its pin with the revolving spiral, and a magnet in circuit with said circuit-closer controlling the revolution of the shaft, substantially as described and shown.

15. The combination of the rack 113, the magnets 8 and 9, pawl 114, pivoted to the armature of magnet 9 and provided with a projecting finger, and the hooked armature 111,

its end extending to a point under the finger of the pawl, substantially as described, and for the purpose set forth.

16. The combination of a type-wheel prowided with a series of radiating slots, printers type placed loosely in said slots, springs for holding said type in their normal position and returning them thereto, a printing-magnet and an armature-lever for forcing out the type upon the paper, and beveled guide points formed on the type-wheel for directing the armature-lever into the proper slot when the two do not exactly register, substantially as described and shown.

17. In a printing-telegraph, a series of keys, each key controlling a circuit-breaker, a mainline circuit passing through each of the said circuit-breakers successively, so that the circuit is broken by the depression of any key, a type-wheel shaft carrying a number of contact-points and placed in proximity to said keys, a magnet in said main-line circuit and mechanism connected therewith for causing the rotation of the type-wheel shaft when the main-line circuit is broken by the depression of a key, a circuit-closing spring attached to each key and adapted when its key is depressed to come in contact with the corresponding point on the type-wheel shaft as the latter rotates, and electrical connections with the main circuit, whereby as the rotating point comes in contact with the spring the main-line circuit is again closed, stopping the rotation of the type-wheel, substantially as described and shown.

18. The combination, with a suitable base, of the pivoted lever 23, the plunger 25, pivoted to said lever and provided with the stop 34, the spring 29, and the rotating point 33, substantially as described.

10. The combination of the pivoted levers 23, contact-points 26 and 27, springs 29, rotating disks 30, provided with points 33, and electrical connections, substantially as and for the purpose set forth.

JOHN B. ODELL.

Witnesses:

FREDERICK O. GooDWIN, E. L. HUBER. 

